538 539 atomic chemistry codingandinformationtheory codingtheory condensedmatterphysics conductionelectrons elementaryparticles equationsofmotion magneticmaterials magnetism mathematics molecular nanotechnology opticalandplasmaphysics physics qc170-197 qc750-766 quantumelectrodynamics quantumfieldtheory quantumoptics quantumphysics quantumtheory spintronics theoreticalandcomputationalchemistry